Telephonic signaling apparatus



(No Mo de l.)

0. RAYMOND, 2nd. Telephonio Signaling Apparatus.

- No. 231,932. Patented Sept. 7 18 80.

N.PETERS, PHOTO-LITHOGRAPHER, W..SHINGTON. DJJ.

i M I UNITED STATES PATENT OFFICEQ CYRUS RAYMOND, 2D, OF DANBURY,CONNECTICUT.

TELEPHONIC SIGNALING APPARATUS.

SPECIFICATION formingpart of Letters Patent No. 231,932, dated September'7, 1880,

Application filed March 27, 1880. (No model.)

To all whom it may concern:

Beit known that I, CYRUS RAYMOND, 2d, of Danbury, in the county ofFairtleld and State of Connecticut, have invented a new Improvement inTelephone Signaling Apparatus; and I do hereby declare the following,when taken in connection with the accompanying drawings and the lettersof reference marked thereon, to be a full, clear, and exact descriptionof the same, and which said drawings constitute part of thisspecification, and represent, in

Figure l, a side view of the telephone with improvementapplied; Fig. 2,a transverse section, showing the invention.

This invention relates to an improvement in telephone signalingapparatus, the object being to arrange the calling apparatus on thetelephone itself, so that one telephone on a circuit of severaltelephones may call and communicate with either of the telephones on thesame circuit without necessarily signaling the central office; and theinvention consists in the construction, as hereinafter described, andparticularly recited in the claim.

A represents a common telephone; B, the ground-wire, attached in theusual manner. ()n the barrel of the telephone are arranged two keys, CD, hung upon a common pivot, to.

d is a metal stud, to which the line-wire E, running in one direction,is attached, so that one end of the key C is held in contact with thesaid metal stud (l by means of a spring, 0, or otherwise. fis a secondmetal stud, to which theline-wireF, running in oppositedirection, isattached,so that the end of the key 1) will rest A on the said stud,held there by its spring h, the

two studs (1 f standing on a non conducting material, 1, so that whenthe two keys rest upon their respective studs the communication is fromone of the line-wires through the two keys to the other line-wire sothat the circuit is complete through the said keys.

L is a metal plate lying under the heel of both keys upon anon-conductor, n, so that either key may be pressed down into connectionwith the metal plate L. From this plate L a wire, N, leads to the otherpole of the magnet of the telephone in the usual manner for attachingthe-line-wire. I

, Now, supposing the person at the telephone desires to call anothertelephone-say on the line E--he presses down the key C, which breaks thecircuit, and the number of breaks indicates the telephone required inthe usual manner. Receiving an answer, he then presses down the key Dinto contact with the plate L, cutting off that portion of the line Fbeyond, and making a connection through the line E, key 0, to the key D,thence through the connection of the keyD with the plate L, through thewire N, to the telephone, in the usual manner, and holds the key D inthis condition while communicating. This practically stops the circuitat this telephone and cuts off all in the opposite direction. Whencommunication is completed release the key D, and it again establishesthe circuit through the entire line.

If the communication be desired in the opposite direction, then theoperation of the two keys C D will be reversed.

One of the keys may be used for signaling the main office in onedirection on the line or any intermediate telephone, and the other forthose in opposite direction.

I claim The combination of a telephone with the two keys C I), one heldin connection with theline in one direction and the other with the linein the opposite direction, and the two keys connected, so that thecomplete circuit is through said two keys, and the plate [1, inconnection with the telephone, and arranged so that either of said keysC D may be brought into connection with said plate, and thereby placethe telephone in circuit, substantially as described. 3

CYRUS RAYMOND, 2D.

